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get_compat_sigset()

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similar to put_compat_sigset()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2017-09-03 21:45:17 -04:00
parent b8e8e1aa9f
commit 3968cf6238
8 changed files with 28 additions and 51 deletions
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kernel/compat.c
+16 -7
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@@ -467,17 +467,26 @@ Efault:
return -EFAULT;
}
void
sigset_from_compat(sigset_t *set, const compat_sigset_t *compat)
int
get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat)
{
#ifdef __BIG_ENDIAN
compat_sigset_t v;
if (copy_from_user(&v, compat, sizeof(compat_sigset_t)))
return -EFAULT;
switch (_NSIG_WORDS) {
case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
case 4: set->sig[3] = v.sig[6] | (((long)v.sig[7]) << 32 );
case 3: set->sig[2] = v.sig[4] | (((long)v.sig[5]) << 32 );
case 2: set->sig[1] = v.sig[2] | (((long)v.sig[3]) << 32 );
case 1: set->sig[0] = v.sig[0] | (((long)v.sig[1]) << 32 );
}
#else
if (copy_from_user(set, compat, sizeof(compat_sigset_t)))
return -EFAULT;
#endif
return 0;
}
EXPORT_SYMBOL_GPL(sigset_from_compat);
EXPORT_SYMBOL_GPL(get_compat_sigset);
int
put_compat_sigset(compat_sigset_t __user *compat, const sigset_t *set,